Introduce module demoextendtemplates

[zuk3975]

Questions	Answers
Description?	Introduce demo module showing how to extend and modify core pages twig templates (see more detailed info in readme)
Type?	improvement
BC breaks?	no
Deprecations?	no
Fixed ticket?
How to test?	install the module, go to orders page and refer to screenshot bellow to make sure module shows all modifications in orders page.

| Possible impacts? | Please indicate what parts of the software we need to check to make sure everything is alright.

[zuk3975]

Raised related PR to fix orders stylesheets parent call. https://github.com/PrestaShop/PrestaShop/pull/29646

[zuk3975]

also blocked by https://github.com/PrestaShop/PrestaShop/pull/29322 (because the example includes decorating order controller and it breaks whole page until the bug is fixed)

[matks]

Raised related PR to fix orders stylesheets parent call. PrestaShop/PrestaShop#29646

Hello @zuk3975 is this the last blocking PR?

[zuk3975]

Raised related PR to fix orders stylesheets parent call. PrestaShop/PrestaShop#29646

Hello @zuk3975 is this the last blocking PR?

yes, as I mentioned in that issue, both PRs should probably be approved by single QA check.

[florine2623]

Tested in combination with https://github.com/PrestaShop/PrestaShop/pull/29646

It is QA ✅ See https://github.com/PrestaShop/PrestaShop/pull/29646#pullrequestreview-1190458860

[zuk3975]

@PrestaShop/committers, @PrestaShop/prestashop-maintainers as Florine tested another related PR it was a nice occasion to approve this PR even though it doesn't yet have mainatiners approvals. So could you please approve it (and merge once the related pr is merged)? :smile: